440 



MESOZOIC TIME. 



includes very nearly all known existing species. The most abundant 

 of these were the Belemnites, already described on page 432. Figs. 



Figs. 792-796. 



Cephalopods. — Fig. 792, Complete osselet of a Belemnite, side-view, reduced; 793, dorsal view 

 of same; 794, a, B.paxillosus ; 795, B. clavatus ; 796, Ink-bag. 



794, 795 represent the bones or osselets of two species, in their ordi- 

 nary broken state ; and Figs. 792, 793 an unbroken one, in two dif- 

 ferent positions. 



Fig. 797. 



Acanthoteuthis antiquus (XX), of the Oolyte. 



